Abstract: A method and system for decoding a data symbol sequence that has been previously encoded using one or more unique code word polynomials in which at least one unique code word polynomial is used more than once. A set of 2d-1 unique branch metrics is computed, using the unique code word polynomials, where d is the number of unique code word polynomials. The computed set of 2d-1 unique branch metrics is stored in a memory. Path metrics are then calculated, based on the stored set of 2d-1 unique branch metrics. A decoded data symbol sequence is generated based on the computed path metrics.

Abstract: A clock generation circuit for an integrated circuit device, such as an SOC, has increased test coverage. The clock generation circuit includes first and second latches that receive an input clock signal at their clock inputs and a selector that receives at first and second data inputs respectively, the input clock signal and an output of the second latch circuit, which is a divided clock signal. A logic gate has a first input connected to an output of the first latch and a second input that receives a scan mode signal. The logic gate generates a selector control signal provided to the selector.

Abstract: A Maximum Likelihood Sequence Estimation (MLSE) decoder that decodes an encoded sequence of data symbols includes a branch metric unit for computing branch metrics for each trellis stage of the encoded sequence, a path metric unit for computing a path metric for each trellis stage using the computed branch metrics, and an M-at-a-time traceback unit for performing an M-at-a-time traceback operation using the computed path metrics. The M-at-a-time traceback operation generates M decoded data symbols in a single M-at-a-time traceback operation.

Abstract: A method and system for decoding a data symbol sequence that has been previously encoded using one or more unique code word polynomials in which at least one unique code word polynomial is used more than once. A set of 2d-1 unique branch metrics is computed, using the unique code word polynomials, where d is the number of unique code word polynomials. The computed set of 2d-1 unique branch metrics is stored in a memory. Path metrics are then calculated, based on the stored set of 2d-1 unique branch metrics. A decoded data symbol sequence is generated based on the computed path metrics.